Digging and loading machine



Wl H. SCHACHT. DIGGING AND LOADING MACHINE.

APPLICATION FILED MAY Z9. 1920.

vPatented 0015.10, 1922.

5 SHEETS-SHEET i.'

if /w Wx H. SCHACHT.

DIGGING AND LOADING MACHINE. APPLICATION FILED MAY 29. 1920.

1,43 1,491 Patented Oct. 10, 1922.

5 SHEETS-SHEET 2.

a4 qwz 52 76 W. H. SCHACHT."

DIGGING AND LOADING MHiN-.

- 'APPLICATIUN FILED MAv29.192o,

Patented, 00u10-, 1922.

um H 4 mmm ww N F/ mm mm... N

w. H. SGH'ACHT. DIGGING AND LOADING MACHINE.

APPucATlN FILE MAY 29, |920.

- Patented Oct. 10, 1922.

5SHEETS-SHEET 4.

. b r IIIIIIIIIIIII'IIIIIII Mcm ummmmw IMQ-VOR 7 w. H. SCHACHI. UIGGING AND LOADING MACHINE.

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' Patented Oct. 10, 1922.

5 SHEETS- SHEET 5.

. v n n To all whom t may concern.'

Patented Oct. 10, 1922.

' UNITED STATES WILLIAM H. S'CHACH'L OF PAINESDALE, MICHIGAN.

DIGGING AND LOADING MACHINE.

Application filed May 29, 1920./ Seria'lNo. 385,294.

y Be itknown that I, VILLIAM H. SGHACHT, a citizen of the United States, anda resi-A dent of Faines'dale,` in the` county of Houghq ton and Stater of Michigan,` have invented certain new and useful Improvements in Digging and Loading Machines, of which the following isla specification, reference be-` ing had to the accompanying drawings.

vl\/Iy.invention relates to digging and loading machines of the type designedfor use in a mine for loading broken and loosened ma ter1al, such as coal or ore, into cars located near by. It is the object of my invention to provide an` improved loading machiney which may be readily and' quickly shifted from one point to another and made ready for use and by reason of whichthe effective range of operation of the machine shall be made as great as possible without unduly increasing the weight of the machine as a whole. The preferred means by which 'I have accomplishedmy object are illustrated in the drawings and are hereinafter specii cally described. That which lbelieveto be new: is set forth in the claims.

A.In the drawings,- 1

Fig. 1 isa side view of my improved machine in position for .operation but with the securing means only partially applied. for holding the machine against movement;

Fig. 2 is a top plan view of my improved machine, certain parts being omitted for clearness of illustration;

Fig. 3 is an end View of my machine as seen from the right in Figs. 1 and 2;

F ig. 4 is a transverse vertical section taken on line 44 of Fig. 2;

Fig. 5 is longitudinal central section taken on line 5-5of- Fig. 2; and

Fig. 6 is a side view of my improved man chine rigidly securedin position showing one phase of the operation of the machine, changed positions of certain operative parts being indicated by dotted lines.

Referring to the several figures of the drawings in which corresponding parts are indicated bythe same reference characters, 15 and 16 indicate the rails of a track held in position upon suitable crossfties 17. A truck frame 18 is supported upon the track by means of wheels 19 mounted upon aXles 20, springs 2l being interposed between the axles and the frame 18, said springs being adapted normally `to `hold downwardly-projecting lugs 22 a' short distance above the rails. IVVhen sufficient downward pressure is brought to bear upon the truckframe 18, the frame is adapted to descend with respect to the axles so as to bring the lugs 22 into 'Contact with thev rails, as is shown in Fig. 6.

Rigidly mounted upon the truck 18 is a base 23.111 the form of a heavy casting. Thisbase 23 providesa support for a turn table 24 which is revolubly mounted thereon, and supported by rollers 25 (see Fig. 1) which bear upon a circular track portion 26.

A circular plate 27 secured upon the base' 23'above the rollers 25 serves to provide an upper bearing for the rollers 25 whereby the turntableis held against tipping with respoot-to the base 23. The circular plate 27 is heldrigidly in position by any suitable means. i The base 23 comprises also a cylinder 28 which in the construction shownis cast integrally therewith in concentric position with .respect to the aXis about which theturn tabler 24 rotates. Slidably mountedwithin the cylinder 28 is a plunger 29 which provided at its upper end with a column or standard 30 equipped with a bearing shoe 31 of any suitable type at its upper end. This construction includes a Huid-operated jack which is adapted to be equipped in. anyapproved manner for attaining the desired operation, the equipment illustrated in the drawings comprising a pump 32 connected to the cylinder by a pipe 33.

The turn table 24 hasiixedly secured thereto at its sides longitudinally-extending channel irons 34 and 35 (see Fig. 4). These channel irons 34 and 35 comprise the side bars of the main supporting frame of my improved mechanism. A cross-bar 36 serves to connect these bars at their rear ends, an engine 37 of any suitable type (see Fig. 1) being mounted upon the cross-bar 36. The engine 37 is connected by any suitable train of mechanism with a vertically-disposed shaft 38 which is provided at its lower end with a pinion 39 lwhich meshes with the teeth of a large gear 40 formed on the outer edge of the base 23. As will be readily understood, by the application of power to the pinion 39, such pinion is caused to revolve about the gear 40, serving to swing the main frame horizontally with respect to the base 23 and the truck 18.

41 and 42 indicate channel irons compris ing the side bars of an elevating frame whichv is pivotally mounted at its rear end so as to swing vertically about a transverse shaft 43, suitably supported upon the main frame (see Fig. 6). The side b ars 41 and 42 of the elevating frame are connected together at their rear ends by an arch 44 in the form of a channell as is shownin Figs. 1 and 5, and they are connected at their intermediate point by a transverse arch 45 in the form of an angle iron. The bars 41 and 42 are further connected together by transverse bars 46, 47 and 48, whereby a rigid structure is formed.

For raising the elevating frame with respect to the main frame about the shaft 43 I have provided a combination of lever and cam means adapted to be operated by suitlin the form of an arc of a circle about the shaft 50, the curved end being provided with suitable grooves 51 at its opposite sides which are adapted to receive cables 52 'secured to the front ends of piston rods 53 secured t0 thepiston 54 of a cylinder 55 securely mounted in position between the arches 44 and 45, The lever 49 is so arranged that the piston rods 53 are arranged tangentially with respect to the arc-shaped portions of the lever, with the result that when the piston 54 is moved toward the left in F 5 as hereinafter describedr for draw ing the lever 49 also toward the left aboutl the axis 50, the piston rods 53 retain the desired effective position with respect to the cables 52 and the lever- 49, the cables 52' being connected to the lever 49 at 56 at the extreme right-hand end of the lever as shown in said Fig. 5. As is best show-n in Fig. 5 the lever 49 is provided at its rear edge portion with supporting rollers 57 rotatably mounted thereon through the medium of a shaft 58. The rollers 57 carried byl the lever 49 stand in con-- tact with a diagonally-disposed support ing bar 59 which is pivotally mounted u on the main frame by means of a horizontallydisposed shaft 60, the bar 59 being in the,

lform of a heavy casting comprising grooved rail sections 61 within which the rollers 57 bear. The rear end of the diagonally-dis,- posed'A support 59 bears upon a collar 62 rotatably and loosely mounted upon the upper end of the cylinder 28 of the base 23, a bearing` for the supporting bar 59 being pro.- vided by the collar 62 at both sides of the column 30 of the jack. By the use of the grooved track construction, the elevating frame is braced laterally to take care of the tendency of the frame to move sidewise during the swinging of the turntable.

By the application of power to the cables 52 to draw them toward the left in Fig. 5,

the lever 49 will be turned in counterclockwise direction as viewed in said figure, thus compelling the roller 57 to move up the diagonally-disposed support 59, thereby causing the shaft 50 and the elevating frame upon which the shaft 50 is mounted to move upward about the shaft 43 which connects the elevating frame with the main frame, an elevated position of the elevating frame being illustrated in Fig. 6.

63 and 64 indicate channel irons forming the side bars o-f an operating frame which is movable longitudinally with respect to the elevating frame. The side bars 63 and 64 are rigidly joined together at their re-ar ends by a cross-bar 65 and are rigidly connected at their front end portions by a heavy cross-bar comprising channel irons 66 and 67 as is best shown in Fig. 5. The side bars 63 and 64 of the operating frame are provided with supporting wheels 68 rotatably mounted thereon as is shown in Fig. 4, the supporting wheels 68 being adapted to engage the flanges of the channel irons 41 and 42 so as to act as anti-friction supports for the operatin frame for its movement longitudinally of the elevating frame. 69 .and 70 indicate cylinders iXedly secured upon the elevating frame at its opposite sides having pistons 71 therein (see Fig. 6) which are connected by means of piston rods 72 and 78 respectively with the cross-bar comprising the channel irons 66 and 67 of the operating frame. By the application of power to the piston rods 72 and 73 for moving them toward the right in Fig'- 1, the operating frame comprising the side bars .and 64v is moved longitudinally of the elevating frame comprising1 the side bars 41 and 42,

74 indicates a heavy scoop of any approved construction pivotally mounted by means of a shaft 75 upon brackets 7 6 lixedly secured upon the forward end of the operating frame. As is best shown in Fig. 1, each bracket 761 is provided with a plurality of openings 77 in anv one of which the shaft 75 may be mounted for varying the position of the scoop 74 with respect to the end portion of the operating frame. The scoop 74 is provided with a reinforced edge portion 78 which is adapted to be brought into close proximity to the rails 15 andV 16 when the scoop is in position to pick up a load as hereinafter described. The rear face 79 'of the scoop 74 is hingedlyy mounted by means of bars 80 upon the body of the scoop so as to be capable of displacement for dumping the contents. Lugs 79a are mounted upon the face 79 of the scoop at its side edges and are adapted to engage backing blocks 81 to limit the backward swinging ofthe scoop. The blocks 81 are mounted upon the operating frame at its oppositel sides, being secu-red in position by any sui-table means. These blocks have diagonallydisposed bearing faces adapted to be engaged by the lugs '79 at different points therealong as the scoop is'lowered on 'the operating frame by the shifting of the shaft i5 as above described. As will be readily understood, when the scoop is so lowered on the operating frame it is capable of swinginfsi` backward farther than when in the position illustrated in the drawings. in this way, the operative edge 7S is capable ofvbeing lowered to a greater degree to stand at an angle to cut in to better advantage for digging. rlihe scoop 7e is provided at its upper end with operating arms 8:2 and 83 which, in the construction shown are in the form of channel irons as is best shown in Fig. 2. The upper ends of the arms 82 and Sare connected by means oi cables Se with piston rods 85 which are.connected With pistonsl S6 in cylinders 87 mounted on the operating frame at its rear end portion. In the construction shown the cylinders 87 are ixedly mounted upon the transverselyextending bar 65 of the operating frame, such connection being effected through the use `of horizontally-disposed pins 88 as is bestA shown in Fig-sgi and 2. The cables 84 extend underneath idler pulleys S9 which are rotatably mounted at the upper ends of standards 90 rising from the .operating frame a short distance lin rear of the crossy bar to which the piston rods i2 and 73 are connected. As will be readily understooc., upon the applicationof power to the cables 84 for moving 'them toward the rear, the scoop 74 is` given a rotary movement about `the shaft 75 in countercioclzwise direction column and the shoe-3l in lowered position so as to be out oi contact with the roof Or back ofv the mine, the truck is adapted to be run along a track into close proximity to a pile of broken rocl or coal which it is desired to have loaded into cars standing upon the vsame track or upon another track near bv. `Vhen the machine has been moved to the desire-d position, the shoe Si is adapted to be forced ouiclrly into Contact with .the roof of the drift, serving to force thev lugs 22 of the truck frame into contact with the rails for holding the machine as aA whole very firmly in position without danger of the machine being displaced longitudinally of the track or of being tipped out of normal position with respect to the track. TWhen theniachine has been secured lirmly in positionj by the admission of ifiuid under presvsure to the rear end portions of the `cylinders 69 and 70 the operating frame is pushed forward through the medium of the piston rods 72 and T3, serving to erative edge of the scoop Tet under a pile of loose material that is to be removed. "dl ien the scoop 7e has been advanced in this manner to the desired point, the movement is stoppe l and the scoop is tipped into the position shown advance the opabout the shaft in solid iines in Fig. 6 with respect to the opeiatiiig` :frame7 this result being attained by the admission of Huid under pressure to the forward ends of the cylinders Si for applying` a backward pull upon the cables Sli as above de? iibed. ihereupon by the admission of i'iuid under pressure `to the forward end ofthe cylinder 557 the lever is given :in operative stroke in counterclocirwise d. ction in i which causes the roller 4to ride up the diagonallydisposed support 59 for raising the elevating iframe as above described. `When the scoop '7i has thus been raised into'position to ciear the top of the car into which the rock is to be dumped, the engine 3T is thrown into operation for driving` the pinion S9 and for turning the machine whole about the base gear 40 so as to bring theiscoop into position above the car. F or accomplishing;v this purpose7 the machine as a whole is adapted to be given necessary a complete rotation about the column 30 of the securing jack. if necessary for the dumping operation, the operating frame may be retracted or extended by the use of the cylinders 69 and "IO :is will be readily understood. VrWhen the scoop 7i has been brought to the desired position above a car,

rthe materiai is dumped from the scoop by the manipuiation oi' the controlling means in the ordinary manner, whereupon the scoop is adapted to be brought back into its operative position as shown in Fig. l for receiving another load.

@n account of the backing lugs 79a in the rear or the movable face '[9 of the scoop having' direct contact at variable points with the blocks Si a very effective construction is provided adapted to withstand the hard usagjeto which such face subjected.

By the use of the jack construction by which downward pressure is applied to the truck from the roof or back of the drift in which the worlr is beingF carried on, I have found that it is unnecessary to make the parts of any greater weight than that necessary providii the required strength. in the way ver*y .much lighter construction than that ordinarily used is attained, wherehy the machine is much more easily and out rlv transported from one point to another; y force directly from the roof of the mine, the iii-ucl: is held much more securely against tijpingi` than can possibly be the case where the wei t of the machine is relied upon for attainino this end. iis a result of my bein Moreover., by the application of llO able in this manner to secure the machine as a Whole so firmly in position, l am enabled to operate at a very much greater distance from the car than could be done before. By

lthe use ot my construct-ion l am enabled to operate as easily and eiiiciently at the side ot the car as l am at a point directly over the track, since l do not in any Way rely upon the stiffness or strength of the track tor holding my machine rigidly in position. lt will be appreciated also that l have accomplished the desired result of holding the machine as a Whole very securely in position Without sacrificing the portability of the machine, since the machine can be released from one position and secured in the next desired opera-tive position in substantially as short a time as that required ttor a shitting movement of the very much heavier machines in use heretofore. This is particularly true with respect t0 those machines oi the prior art which are adapted to be clamped to the track.

It Will be understoor` that any suitable means may be employed for controlling the admission of fluid under pressure from any suitable source to the several cylinders above referred to on either side oi the piston, and I havey accordingly not illustrated nor described such means herein since it forms by itself no part ot my present invention.

By the use of my improvements, a very effective construction is attained which is capable ot use to very good advantage at a distancefrom the track. As Will be understood from an examination of the structure,

the scoop Tet is adapted to be lowered liar.

as may be desired below the `level of the rails, either at the side ot the track or at a point beyond the rails when the machine is positioned at the end ot the track. The machine is thus available for cutting out the material in advance tor laying the ties and the rails of the track, it desired. n

What l claim as my invention and desire to secure by Letters Patent is,-

l. in underground loading machine comprising a base, a turn table mounted on said base and adapted to rotate thereabout, and a jack extending upward from said base through said turn table adapted to apply pressure trom the roo-r' to said base for holding the base in position.

2. An underground loading machine comprising a base, a turn table mounted on said base and adapted to rotate thereabout, said turn table having an opening therethrough about the axis upon which it is rotatably mounted, and a ack projecting upward through said opening adapted to apply pressure from the roof to said base for holding the base in position.

3. An underground loading machine comprising a Wheeled truck, a turn table mounted on said truck and adapted to rotate about a vertical axis thereon, said turn table having an opening therethrough about the axis upon which it is rotatably mounted, and a jack projecting upward through said openadapted to apply pressure trom the roof to said truck for holding the truck securely in position. v

1l. in underground loading machine comprising a truck frame, Wheels Jfor supporting said truck iframe upon a track, yielding means interposedbetween said truck frame and said supporting Wheels, and a jack adapted to apply pressure from the root to said truck trame for bringing said frame into contact with the track lagainst the action of said yielding means for holding said framesecurely in position.

5. An underground loading machine com# prising a truck trame, Wheels supporting said truck -frame upon a track, yielding means interposed between said truck frame and said supporting Wheels, a jack'adaptedV to apply pressure trom the root to said truck frame and to bring said trame into Contact with the track against the action of said yielding means tor holding said trame se curely in position,r and a turn table mounted on said truck frame and adapted to rotate about said jack.

G. An underground loading machine comprising a truck frame, Wheels for supporting said truck frame upon a track, lugs on said irame overlying vthe rails of said track, springs interposed between said supporting Wheels and said truck frame adapted normally to support said lugs a shortdistance above said rails, a jack adapted to apply pressure from the roof to said truck frame tor bringing said lugs into Contact With the rails for holding the truck frame securely in position, and a turn table mounted on said truck frame and adapted to rotate about said jack. f

'7. An underground loading' machine comprising' a truck frame, Wheels for supporting said truck frame upon a track, lugs on said fra-me overlying the rails of said track, springs interposed between said supporting Wheels and said truck 1era-me adapted normally to support said lugs a. short distance above said rails, a turntable mounted on said truck frame and adapted t-o rotate about a. vertical axis thereon, said turn table having an opening therethrough about the axis upon which it is rotatably mounted, vand a jack adapted to apply pressure from the root to said truck frame for bringing said lugs into contact with the rails for holding the truck frame securely in position.

8. An underground `loading machine comprising a truck trame, Wheels for supporting said truck trame upon a track, lugs on said frame overlying the rails of said track,V

springs interposedbetween said supporting Wheels and said ytruck frame adapted normally to support said lugs a short distan/.3e above said rails, a turn table mounted on said truck iframe and adapted to rotate about a vertical axis thereon, said turn table hai.L ing an `opening therethrough about the axis upon which it is rotatably mounted, power operated s-eooping means mounted on said turntable and ladapted to Work at a considerable distance therefrom, and a jack adapted to `apply pressure 'from the roof to saidl truck frame for bringing said lugs into Contact with the rails for holding the truck frame securely in position.

9. An underground loading machine comprising a base, a main trame mounted on said base and adapted to rotate about a vertieal axis thereon, an elevatingtrame pivotally mounted on a horizontal on said main iframe, power-operated seooping means supported by said elevating traine, and a jack extending` upward through both ett said frames adapted to apply pressure from the roof to said base for holding the base securely in position..

l0. An underground loading machine comprising a base, a inain 'trame mounted on said base and adapted to rotate about a vertical axis thereon, an elevating iframe pivotally mounted on a horizontal axis on said main frame, power-operated-scooping means supported by said elevating trame, both of said frames having openings `therethrough about the axis upon Which said main frame is rotatably mounted, and a jack projecting upward through sai d openingsadapted to apply pressure troni the roof to said base tor holding said base securelyin position.

ll. An underground loadingcomprising a base, a main iframe on said base and adapted to rotate about vertical axis thereon, an operating iframe movable longitudinally With-respect to said main frame, power-operated snooping means supported by said 'operating frame, and a jack extending upward through both el' said frames adapted to apply pressure from the roof to said base for holding said base securely in position.

l2.' An underground. loading machine comprising a base.v a main frame mounted on said base and adapted to rotate about a vertical axis thereon, an operating frame movable longitudinally With respect to said main frame and also adapted to swing about a horizontal axis with respect thereto, power-operated seooping means supported by said operating frame, and a jack extending upward through both of said frames adapted to apply pressure from the root` to said base for holding said base securely in position Without interfering with the operative movements of said frames.

13. An underground loading machine comprising a base, a main frame mounted on said base and adapted to rotate about a vertical axis thereon, an operating frame movable longitudinally with respeet to said main frame, `said operating trame being p rovided with a longitudinally-extending open-- ing therethrough, power-operated scooping means supported by said operating trame, and a jaclr extendingv upward through said main frame and through said longitudinallyextending opening` in said operating iframe adapted to apply pressure from the root to said base for holding said base securely in position.

14. An underground loading machine comprising ak base, a main trame mounted on said base and adapted to rotate about a vertical axis thereon, an elevating iframe pivotally mounted upon a horizontal axis on said main frame, an operating frame movable longitudinally Wi'tn .respect to said elevating frame, power-operated seooping means supported by said operating frame, and a jaelr extending upward througli .all three oi' sait trames adapted to apply pres-- ure trom the rooiE tors-aid base iior holding said base securely in position Without inten tering with the operative movements ot'isaid, iframes.

l5. in under round loading machine oomprising a b,

a main trame mounted on 7 said base and adapted to rotate about a vertical axis thereon, an elevating frame pivotally mounted upon a horizontal axis on said main trame, an operating frame movable longitudinally with respect to said elevating trame, power-operated scooping means support-ed by said operating frame, eaoh of said frames having an opening therethrough about the axis about which said main frame rotates, the opening through said operating frame being elonlongitudinally thereof, and a jack extending upward through the openings in said frames adapte-d to apply pressure trom the roeie to said base for holding said base securely in position Without interfering with the operative movements ot said 'lira-nies.

16, Jin underground loading machine-comprising a base, a'main Jframe mounted on said base and adapted to rotate about a vertical axis thereon, an elevating trame pivotally mounted on a. horizontal axis on said main lrame, power-operated seooping means supported by said elevating iframe, a jack extending upward through both of said frames adapted to apply pressure from the roof to said base for holding the base securely in position, and means carried by said .trames tor swinging the elevating frame upvard with respect to said main frame.

lOO

main frame, power-operated scooping means supported by said elevating frame, a jack extending upward through both ot' said frames adapted to apply pressure trom the root to said base for holding the base securely in position, levei` carried by one of said trames, and means for swinging said lever into contact with a suitable portion of the other of said frames for causing said elevating trame to swing upwardly with respect to said main trame.

18. An underground loading machine comprising a base, a main frame mounted on said base and adapted to rotate about a vertical axis thereon, an elevating irame pivotally mounted on a horizontal 'axis on said main trame, power-operated scooping means supported by said elevating frame, a jack extendingv upward through both of said :trames adapted to apply pressure from the roof to said base for holding the base se-v curely in position,l a lever carriedby one of the said frames, a roller carried by said lever, and means for swinging said lever for bringing the roller into contact with a suitable portion ot the other of said frames for causing said elevating l'rame to swing upwardly with respect to said main trame.

19. An underground loading machine comprising a main trame, an elevating frame pivotally mounted on a horizontal axis on said main trame, power-operated scooping means supported by said elevating frame, a lever pivotally mounted on one of said trames, a diagonally-disposedy member mounted on the other of said trames, and means for swinging said lever into operative contact with said diagonally-disposed member for causing said elevating 'trame to swing upwardly with respect to said main frame.

20. An underground loading machine comprising a. main trame, an elevating trame pivotally mounted on a. horizontal axis on said main frame, poweroperated scooping means supported by said elevating frame, a lever pivotally mounted on one of said trames, a roller rotatably mounted on said lever, an inclined support mounted on the other of said frames, and means for swinging said lever for causing said roller to ride up said inclined support for swinging the elevating frame upwardly with respect to said main trame.

2l. An underground loading machine comprising a main trame, an elevating trame pivotally mounted on a horizontal 'axis on said main frame, power-operated scooping means supported by said elevating frame, a lever pivotally mounted on saidy elevating frame, the end of said lever being in the form of an arc of a circle about the axis upon which the lever is mounted, a roller, rotatably mounted on said lever, an inclined support mounted on the main frame, a groove in the arc-shaped portion ot said lever, a cable extending along said groove and secured to the lever at one end ot the groove, and means for exerting a pull on said cable on a line parallel with the elevating frame for swinging said lever and causing said roller to ride up said inclined support for swinging the elevating trame upwardly with respect to said main frame.

in underground loading machine comprising a base, an operating frame movably mounted with respect to said base, a scoop mounted on said operating frame adapted to be 'forced into apile of material to be moved, said scoop being provided with a movable wall portion adapted to be displaced for dumping the contents of the scoop, supporting lugs mounted on the outer face of the movable wall portion, and backing blocks mounted on the operating frame adapted to engage said lugs for supporting the scoop during the operative scooping movement of the operating frame.

23. An underground loading machine comprising a base, an operating frame movably mounted with respect to said hase, a scoop pivotally mounted on said operating frame on a movable pivot adapted to be shifted vertically with respect to said operating trame, lugs on said scoop, and' backing. blocks on said operating frame adapted to be engaged by said lugs for limiting the backward swinging ot said scoop, the bearing faces of said blocks being diagonallydisposed for permitting the scoop to swing backward to an increased extent as the pivot of said scoop is lowered with respect tothe operating frame.

WILLIAM H. soi-molar. 

